Anthropic Now Watermarks Every Claude Output — Invisibly, With No Opt-Out

Anthropic began embedding invisible watermarks into all Claude-generated text and files starting August 2, tied to EU AI Act compliance, making content provenance a default rather than a feature.

Anthropic has started adding an invisible watermark to all text and files generated by Claude, according to a report from @IndianTechGuide that drew several thousand engagements. The watermark applies to outputs from models running August 2 onward, is imperceptible to humans, and — critically — offers no opt-out for users.

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